Deteccion dispositivo javascript 

function detectBrowser() {   var useragent = navigator.userAgent;   var mapdiv = document.getElementById("map_canvas");        if (useragent.indexOf('iPhone') != -1 || useragent.indexOf('Android') != -1 ) {     mapdiv.style.width = '100%';     mapdiv.style.height = '100%';   } else {     mapdiv.style.width = '600px';     mapdiv.style.height = '800px';   } }